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Progressivism is a political philosophy and reform movement that reached its height early in the 20th century. Middle class and reformist in nature, it arose as a response to the vast changes brought by modernization such as the growth of large corporations, pollution and rampant corruption in American politics. In the 21st century, progressives continue to embrace concepts such as environmentalism and social justice. While the modern progressive movement may be characterized as largely secular in nature, by comparison, the historical progressive movement was to a significant extent rooted in and energized by religion.

Historian Alonzo Hamby defined American progressivism as the "political movement that addresses ideas, impulses, and issues stemming from modernization of American society. Emerging at the end of the nineteenth century, it established much of the tone of American politics throughout the first half of the century".

Progressive Era